CONTENTS1. Introduction.................. 32. Systematic part................. 6Gulella adamsiana................. 7Gulella darglensis................. 14Gulella elliptica................. 19Gulella farquhari................. 27Gulella infrendens................ 33Gulella planti...................................... 39Gulella vicina....... ....... 44 Gulella zuluensis................. 493. Concluding remarks................ 544. Summary................... 585. References.................. 586. Index to trivial names in Gulella............. 621.INTRODUCTIONThe concept of subspecies has been applied to terrestrial molluscs at a comparatively early stage. Mayr (1942) quotes the works of Rossmässler (1826), Kobelt (1881), the Sarasin brothers (1899), Gulick (1905), and particularly Rensch (since 1929) as examples of proponents or precursors of this concept. Since the 1930s the polytypic species has been generally accepted among students of land snails. However, so far it has played a relatively minor role in comprehensive works on African (Afrotropical) land molluscs, such as Pilsbry (1919), Connolly (1939) and Bequaert (1950) 1).Undoubtedly a fragmented topography (e.g., island areas such as Indonesia)